Docker Hub - Docker Hub is a cloud-based registry service
Kahoot! - Kahoot! makes it easy to create, play and share fun learning games in minutes—for any subject, in any language, on any device.
Azure Container Registry - Store images for all types of container deployments and OCI artifacts, using Azure Container Registry.
Sli.do - Slido is the ultimate Q&A and polling platform for live and virtual meetings and events. It offers interactive Q&A, live polls and insights about your audience.
Artifactory - The world’s most advanced repository manager.
Mentimeter - a web-based polling tool for workshops, conferences & events